Ventilation.



S. C. DAVIDSON.

VENTILATION.

APPLICATION FILED MAY n; I915.

Patented July 31, 1917.

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APPLICATION FILED MAY II, 1915.

S. C. DAVIDSON.

VENTILATION.

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VENTILATION.

APPLICATION FILED MAY II. 1915.

Patented July 31, 1917.

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S.. C. DAVIDSON.

VENTILATION.

APPLICATION FILED MAYH. 1915.

1,234,736. Patented July 31, 1917.

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S. C. DAVIDSON.

VENTILATION.

APPLICATION FILED MAY 1|. 1915.

Patented July 31, 1917.

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VENTILATION.

Specification of Letters Patent.

' Patented July 31, 1917.

Application filed Kay 11, 1915. Serial No. 27,292.

To all whom it may concern:

Be it known that I,' SAMUEL CLELAND DAVIDSON, subject of the Kin of Great Brit am, of Sirocco Engineering orks, Belfast, Ireland, merchant, have invented certain new and useful Improvements Relatingto Ventilation, specification.

This invention relates to ventilation and has for its object to provide an improved apparatus for the better ventilation of public buildings, hospitals,- ships, and so forth, and is adapted to be laced in convenient d to a system of air trunks which distribute the air to the re qulred spaces in the usual manner.

According to this invention the apparatus which may combine as a complete unit means for heating, humidifying, ozonizing, and distributing air, is provided with means for breaking the well known monotony of atmosphere usually produced by a plenum system, this being accomplished. by providlng an automaticdevice for cutting out or by-passing the heater and turning 1t on again at certain predetermined intervals.-

The automatic control of the heater may be efiected by a timed valve driven by gearing from the fan motor or other motor in the ap aratus and adapted to turn on and ofi t esupply of steam to the heater, the frequency with which the heating element is on and ofi can be preadjusted so as to produce as near as possible a result which may be likened to the reviving and refreshing eflect produced by opening windows in a stuffy room on a breezy day.

I As an alternative, the heater may be byassed by means of a swing damper or simimeans operated by caring from a motor in the apparatus, w 'ich damper would cut out the heater and admit cold air from the atmosphere or from an air cooler as the circumstances ma require or admit.

Where electric eating is used the cut-out arrangement could be arranged to work directly on to a make and break switch or in other suitable manner.

Where steam heat is used each unit erably consists of a heater of the in ular steam type arranged with one or more sections and which is supplied with steam to the inside of the tube, the air being drawn from the atmosphere over the outside of said tube by means of a centrifugal fanwith directly coupled motor and thereby heated of which the following is a to the required temperature. Another system of heating may be adopted by using an electrlc heater'in which a primary heater is utilized to produce the heat which will Y then be dissipated through .cast iron or similar grids.

ing the air by the use of a humidifier placed preferably in the fan discharge, the control of the same being interlocked with the main steam supply whereby it is cut oil at corre-' sponding periods with the heater.

The combined apparatus may also include means for ozonizing the air by useof a known apparatus consisting of a static transformer and ozone generator, which is placed ref- I preferably on the suction side of the fan and in the path of the air. In cases where the air supply is dusty the ozone generator is inclosed and fitted with a filtermg medium on the inlet to prevent the clogging of the generator. In addition to the well known benefits obtained by having the air ozonized, additional advantages are obtained as it has been found that a much smaller volume of ozonized air will give adequate ventilation. Advantages may be taken of this ieature to out down the size of air distributing ducts, which is an important consideration, particularly when applied to ship work w ere the space available for such ducts is limited. The accompanying drawings show one construction of heater unit made in accordance with this invention.

Means may also be provided for humidity-j Figure 1 is a sectional elevation of the main portion of the apparatus:

Fig. 2 is an end view with part of the casing removed.

Fig. 3 is an end view. Fig. 4 is a plan. Fig. 5 is a sectional detail view of the humidifier shown in Fig. 1, and

Figs. 6 and '7 are longitudinal cross sections respectively of the timing valves, and

Fig. 8 is a sectional elevation similar to Fig. 1 showing a modified construction where the heater is by-passed.

Referring to the accompanying drawings Figs. 1 to 7 a represents a centrifugal fan direct driven by the A. 0. electric motor 6. The

air is drawn from the atmosphere through the opening a by means of the fan action,

and in its path passes overthe tubes of the steam heater (1 which may be in one or more case represented by h and which is lagged with non-conducting material j held in place by sheets 70, Z represents the steam supply pipe which is connected to the time valve m. This valve is operated by the spindle 01. through the reduction gear 0. The details of the valve mare shown in Figs. 6 and 7 from which it will be seen that the port m which leads into the rotary plug m travels around for the greater part through the surrounding open passageway m the passage being cut off on reaching the part we where it makes for a predetermined period a close contact with the inclosing casing and shuts ofi the supply of steam. The whole of this gear can be placed inside the casing by altering the design and fitting the valves with long handles to be operated from the outside. The reduction gear 0 is in turn directly driven from the spindle of the tan motor b. 39 represents valves controlling the heater sections and g'represents a valve controlling the steam supply to humidifier. 1' represents the start of the air duct system. .9 represents the humidifier which is shown in larger detail in Fig. 5. This humidifier consists of a casing .9 having a dividing par tition t extending to near the bottom; the top is flanged and jointed to a cover '10. Steam is admitted to the casting 8 through the pipe t which is controlled by the valve 9 and impinges on the partition t thus deposltmg any water which may be present, which water is drained away through the pipe 0 and joins the main drain from the heater. The steam then leaves the humidifier through the comparatively larger bore 7 pipe w which is made with a flared end in order to reduce the Velocity.

Fig. 8 shows a modified arrangement where the heater is by-passed, in this construction the timing spindle at instead of operating avalve'to cut oii steam from the heater as in Fig. 1, serves to operate a bypass flap a: through links m m and bevel wheels 3, y. The bevel wheel 1,! is provided with a pin 7 working in a sloty" in the link y. The by-pass flap w is pivotally mounted about the inlet 0 to the'heater' chamber and controls both the inlet c and another inlet a to a by-pass passage .2 which pames around to the side of the casing. and enters the same below the heater and above the ozonizing apparatus and adjacent to the space which leads to the fan intake. In

operation-the flap w-first-normally occupies the vertical position, closing the duct 2 and allowing the air'to pass in over the heater as indicated by the dot-ted arrows, while the timing apparatus serves at the prede termined period to lower the flap m and close the inlet 0 and opening the inlet 0 to the by-pass' passage 2 permitting air to pass to the fan without passing over the heater.

What I claim and desire to secure by Letters Patent is 1. The combination with a heating and ventilating apparatus of means for continuously supplying air to the structure to be ventilated and automatically acting means for varying the temperature of the air distributed over certain predetermined periods or atprearranged intervals for the purpose of varying the monotony of atmosphere in the ventilated rooms or spaces.

2. A combined heating or ventilating and air distributing unit consisting of a heater, an air distributing fan with motor adapted to continuously pass a current of air through the apparatus, and means operated by the motor and ada ted to suspend the heating effect of the eater on the air passing through the apparatus.

3. A combined heating or ventilating and air distributing unit consisting of a heater, a fan adapte to pass a current of air through the apparatus, a motor driving said fan, and a supply valve driven from the motor and adapted to out off and turn on the supply of steam or heating medium to theheater at prearranged intervals of time. 4. A combined heating or ventilating and air distributing unit consisting of a casing,

an air inlet to the upper part of the casing, an air heater disposed adjacent to the air inlet, a centrifugal fan disposed in the lower part of the casing, a motor driving said fan also disposed in the casing, a shield directing the heated air toward the fan intake, said shield extending over and protecting the motor or 'a part thereof fromthe hot an, a discharge duct leading out of the casing from the fan, a valve adapted to out 0E and turn on the supply of heating medium to the heater, and an operating connection to said valve'from said motor for operating said valve at prearranged intervals of time to out oli and turn on the supply of heating medium to the heater.

5. A combined heating or ventilating and air distributing unit consisting of a casing,

an air inlet to the casing, an air heater dlsposed adjacent to the air inlet, a centrifu-j gal fan disposed in the casing, a motor drivfrom the fan, a valve adapted to out 01f and turn on the supply of heating medium to the heater, means including timing gear for operating said valve from the fan motor whereby the valve will be 0 ened and closed continuously supplying air to the structure a to be ventilated, a heater adapted to heat said air and automatically operating means for cutting out the heater at predetermined intervals to vary the temperature of the air distributed over certain periods or at prearranged intervals for the purpose of varying the monotony of atmosphere in the ventilated rooms or spaces.

In Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

SAMUEL GLELAND'DAVIDSON. I

Witnesses:

WILLIAM Pnornns Bmox, ROBERT MARTIN- 

